From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id C66823858D37; Wed, 2 Nov 2022 01:42:09 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org C66823858D37 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1667353329; bh=uQtyfETk6DsvHE7xCx/ybOSYqV5DjE3OPWbDWCjrs4A=; h=From:To:Subject:Date:In-Reply-To:References:From; b=nvWkFzVMpUOCvfR+A0TKpw4zj3/vAGZqsKmCejyJINxUX+OA0IExT5l3RrktDMrH9 kyw2LaGPqBVN40XfWlzuV8MOzxho/qbzNWHJStkiU6UK7m+NTsLIRTA4eOSabclzyY vfwpQtMpls72fU9SfrITrNXQdItfL5Vk5xf0H2h0= From: "pinskia at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/105532] UBSAN: gcc/hwint.h:293:61: runtime error: shift exponent 64 is too large for 64-bit type 'long unsigned int' Date: Wed, 02 Nov 2022 01:42:08 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: tree-optimization X-Bugzilla-Version: 13.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: pinskia at gcc dot gnu.org X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 List-Id: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105532 --- Comment #1 from Andrew Pinski --- Hmm, so prec is 0 here. gcc_checking_assert (prec < HOST_BITS_PER_WIDE_INT); int shift =3D HOST_BITS_PER_WIDE_INT - prec; return ((HOST_WIDE_INT) ((unsigned HOST_WIDE_INT) src << shift)) >> shift; That is the only way to get a shift of 64.=